| B&A Restaurants Limited | Hospitality | 2023 |
| B. Dobson & J. Mcmickan Holdings Limited | Real estate | 2026 |
| B.& M. Babbage & Co. Limited | Construction | 1984 |
| B.E Decorators Limited | Construction | 2020 |
| B.L.P Asset Management Ltd | Real estate | 2025 |
| B.Tox Clinic Limited | Professional & scientific | 2018 |
| B.W.M Removals Ltd | Transport & logistics | 2025 |
| B10SEC Cybersecurity and Data Protection Limited | Information & communication | 2023 |
| B2B Accountancy Limited | Professional & scientific | 2015 |
| B2B Digital Group Ltd | Information & communication | 2020 |
| B2GWINES Ltd | Wholesale & retail | 2025 |
| B3RRY Ltd | Information & communication | 2025 |
| BA Bolts Limited | Manufacturing | 2013 |
| BA Conveyancing Limited | Other services | 2026 |
| BA Precision Engineering LLP | | 2019 |
| Baba Roga Ltd | Manufacturing | 2021 |
| Babel Babies Ltd | Other services | 2013 |
| Baber Transport Limited | Transport & logistics | 2013 |
| Baber Young Ltd | Financial services | 2025 |
| Bablec Limited | Construction | 2021 |
| Baby Bebe Boutique Ltd | Wholesale & retail | 2011 |
| Babylon Investments Limited | Real estate | 1996 |
| Bach LLP | | 2024 |
| Back Catalogue Distribution Ltd | Information & communication | 2014 |
| Back Door Frames Ltd | Construction | 2009 |
| Back on WAX Ltd | Information & communication | 2025 |
| Badass Girl Ltd | Wholesale & retail | 2021 |
| Badass Tools Limited | Wholesale & retail | 2020 |
| Bademli Ltd | Hospitality | 2019 |
| Badera Ltd | Wholesale & retail | 2025 |
| Badger Properties Limited | Real estate | 2018 |
| Badges and Medals UK Limited | Wholesale & retail | 2026 |
| Badgeworth Consultants Ltd | Real estate | 2025 |
| Badgeworth Developments Ltd | Construction | 2019 |
| Badgeworth Lane Developments Ltd | Construction | 2022 |
| Badham Pharmacy Limited | Wholesale & retail | 2006 |
| Bafford Education Limited | Education | 2021 |
| Baggott Church Street Limited | Wholesale & retail | 1977 |
| Bagnell Grey Equestrian Limited | Hospitality | 2025 |
| BAK Designs Ltd | Manufacturing | 2023 |
| Bake & Brew (Cheltenham) Limited | Hospitality | 2019 |
| Baker & Graze Ltd | Hospitality | 2015 |
| Balanced Bobbins Design Ltd | Professional & scientific | 2019 |
| Balanced Bobbins Ltd | Real estate | 2024 |
| Balanced Future Ltd | Professional & scientific | 2010 |
| Bales Homes Ltd | Construction | 2016 |
| Balfe's Electrical Services Ltd | Construction | 2025 |
| Balios Limited | Real estate | 2020 |
| Ballard Associates Ltd | Financial services | 2025 |
| Ballathie Contract Services Limited | Professional & scientific | 2009 |
| Ballndad Ltd | Financial services | 2021 |
| Ballodair Equestrian UK Limited | Arts & recreation | 2024 |
| Ballpark Ventures LLP | | 2011 |
| Balls Grinding Limited | Manufacturing | 2002 |
| Ballymaconn Limited | Health & social care | 2005 |
| Balmoral Court Estates Limited | Households | 2017 |
| BAM (Glos) Limited | Construction | 2018 |
| BAM Advertising Holdings Limited | Professional & scientific | 2011 |
| BAM Agency Limited | Professional & scientific | 2000 |
| Bambridge Holdings Ltd | Financial services | 2024 |
| Bamford & Alsop Systems Limited | Information & communication | 2025 |
| BAN Thai Massage Cheltenham Limited | Other services | 2023 |
| Bandras 365 Ltd | Information & communication | 2018 |
| Bandstream Limited | Real estate | 1996 |
| Bank House Communications Limited | Professional & scientific | 1995 |
| Banner Hardware Limited | Wholesale & retail | 1986 |
| Banner Lane Limited | Administrative & support | 2020 |
| Banning Street Properties Limited | Real estate | 2025 |
| Bannister House Participating Residents Freehold SE14 Limited | Households | 2021 |
| Banyan Tree Forest Limited | Hospitality | 2020 |
| Bar NO9 Ltd | Hospitality | 2019 |
| BAR7MANAGEMENT Limited | Hospitality | 2022 |
| Barakah Consultancy Limited | Wholesale & retail | 2018 |
| Barax Limited | Other services | 2016 |
| Barbel Concrete Company Limited | Manufacturing | 1984 |
| Barber Industries Ltd | Other services | 2019 |
| Barber Industries Rental Ltd | Other services | 2025 |
| Barber N Bar Ltd | Other services | 2016 |
| Barber of Fleet Street Ltd | Wholesale & retail | 2019 |
| Barbican Properties Limited | Real estate | 2005 |
| Barchester Properties (UK) Limited | Real estate | 1997 |
| Barclay Dalton Ltd | Administrative & support | 2026 |
| Bare-Faced Holdings Limited | Real estate | 2016 |
| Bare-Faced Medical Aesthetics Limited | Health & social care | 2007 |
| Barebones Farmhouse Limited | Hospitality | 2024 |
| Barker Bygrave Developments Ltd | Wholesale & retail | 2004 |
| Barkerbass Ltd | Wholesale & retail | 2026 |
| Barking Buds Limited | Other services | 2022 |
| Barley and Co Medical Limited | Health & social care | 2020 |
| Barleyfields Property Ltd | Construction | 2022 |
| Barn View Glasshouses Limited | Wholesale & retail | 2023 |
| Barnard & Hill Limited | Professional & scientific | 1930 |
| Barnbury (UK) Limited | Professional & scientific | 2004 |
| Barnbury Limited | Wholesale & retail | 2023 |
| Barnes Capital Limited | Real estate | 2017 |
| Barnes Consortium Developments Ltd | Real estate | 2018 |
| Barnes Residential Ltd | Construction | 2017 |
| Barnham Marketing Ltd | Professional & scientific | 2024 |
| Barnrose Ltd | Construction | 2026 |
| Barr Hall Farm Bess Limited | Energy | 2023 |